Tim Ferriss, author The 4-Hour Workweek and The 4-Hour Body, discusses how he tracks his life's data in the 4-hour everything.

Tim Ferriss

A self-described human guinea pig, Tim Ferriss has parlayed his self-experimentation into a pair of blockbuster self-help books. His first, The 4-Hour Workweek: Escape 9–5, Live Anywhere, and Join the New Rich, shares the secrets to his success in outsourcing most of the work for his online nutritional-supplements company, BrainQuicken. The 4-Hour Body: An Uncommon Guide to Rapid Fat-Loss, Incredible Sex, and Becoming Superhuman, chronicles his efforts to maximize his physical potential. Ferriss holds the world record for executing the most tango spins in a minute, a feat he performed on the TV show Live with Regis and Kelly. He is a guest lecturer at Princeton University and a faculty member at Singularity University.